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<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>基本选择器</title>
    <link rel="stylesheet" href="./css/001.css">
</head>
<body>
<h1>标题</h1>
<h1 class="one">标题</h1>
<h1 class="two">标题</h1>
<h1 id="five">标题</h1>
<h1 id="six">标题</h1>
</body>
</html>